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Reportable Segments (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Reportable Segments |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | item |  |  |  |  |  |  |  |  |  | 2 |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |
Lease rent revenue |  |  |  |  |  |  |  |  |  | $ 175,609 | $ 130,369 | $ 119,895
Revenue |  |  |  |  |  |  |  |  |  | 87,009 | 80,189 | 57,091
Spare parts and equipment sales |  |  |  |  |  |  |  |  |  | 71,141 | 51,423 | 17,783
Gain on sale of leased equipment |  |  |  |  |  |  |  |  |  | 6,944 | 4,929 | 3,482
Other revenue |  |  |  |  |  |  |  |  |  | 7,644 | 7,930 | 9,023
Total revenue |  | $ 118,190 | $ 80,958 | $ 78,702 | $ 70,497 | $ 63,189 | $ 65,861 | $ 67,844 | $ 77,946 | 348,347 | 274,840 | 207,274
Expenses: |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  | 76,814 | 66,023 | 66,280
Cost of spare parts and equipment sales |  |  |  |  |  |  |  |  |  | 61,025 | 40,848 | 13,293
Write-down of equipment |  |  |  |  |  |  |  |  |  | 10,651 | 24,930 | 9,514
General and administrative |  |  |  |  |  |  |  |  |  | 72,021 | 55,737 | 47,780
Technical expense |  |  |  |  |  |  |  |  |  | 11,142 | 9,729 | 6,993
Net finance costs |  |  |  |  |  |  |  |  |  | 64,220 | 48,720 | 41,281
Total expenses |  |  |  |  |  |  |  |  |  | 295,873 | 245,987 | 185,141
Earnings from operations |  |  |  |  |  |  |  |  |  | 52,474 | 28,853 | 22,133
Total assets | [1] | 1,934,943 |  |  |  | 1,603,431 |  |  |  | 1,934,943 | 1,603,431 |
Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |
Other revenue |  |  |  |  |  |  |  |  |  | (1,662) | (1,373) | (1,635)
Total revenue |  |  |  |  |  |  |  |  |  | (1,662) | (1,373) | (1,635)
Expenses: |  |  |  |  |  |  |  |  |  |  |  |
Earnings from operations |  |  |  |  |  |  |  |  |  | (1,662) | (1,373) | (1,635)
Leasing and Related Operations | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |
Lease rent revenue |  |  |  |  |  |  |  |  |  | 175,609 | 130,369 | 119,895
Revenue |  |  |  |  |  |  |  |  |  | 87,009 | 80,189 | 57,091
Spare parts and equipment sales |  |  |  |  |  |  |  |  |  | 30,122 | 22,285 | 3,335
Gain on sale of leased equipment |  |  |  |  |  |  |  |  |  | 6,944 | 4,458 | 3,246
Other revenue |  |  |  |  |  |  |  |  |  | 7,579 | 7,702 | 8,711
Total revenue |  |  |  |  |  |  |  |  |  | 307,263 | 245,003 | 192,278
Expenses: |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  | 76,502 | 65,677 | 65,939
Cost of spare parts and equipment sales |  |  |  |  |  |  |  |  |  | 28,290 | 17,344 | 2,394
Write-down of equipment |  |  |  |  |  |  |  |  |  | 10,651 | 24,930 | 9,514
General and administrative |  |  |  |  |  |  |  |  |  | 67,608 | 52,024 | 44,703
Technical expense |  |  |  |  |  |  |  |  |  | 11,142 | 9,729 | 6,993
Net finance costs |  |  |  |  |  |  |  |  |  | 64,220 | 48,720 | 40,813
Total expenses |  |  |  |  |  |  |  |  |  | 258,413 | 218,424 | 170,356
Earnings from operations |  |  |  |  |  |  |  |  |  | 48,850 | 26,579 | 21,922
Total assets |  | 1,882,860 |  |  |  | 1,556,406 |  |  |  | 1,882,860 | 1,556,406 |
Spare Parts Sales | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |
Spare parts and equipment sales |  |  |  |  |  |  |  |  |  | 41,019 | 29,138 | 14,448
Gain on sale of leased equipment |  |  |  |  |  |  |  |  |  |  | 471 | 236
Other revenue |  |  |  |  |  |  |  |  |  | 1,727 | 1,601 | 1,947
Total revenue |  |  |  |  |  |  |  |  |  | 42,746 | 31,210 | 16,631
Expenses: |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  | 312 | 346 | 341
Cost of spare parts and equipment sales |  |  |  |  |  |  |  |  |  | 32,735 | 23,504 | 10,899
General and administrative |  |  |  |  |  |  |  |  |  | 4,413 | 3,713 | 3,077
Net finance costs |  |  |  |  |  |  |  |  |  |  |  | 468
Total expenses |  |  |  |  |  |  |  |  |  | 37,460 | 27,563 | 14,785
Earnings from operations |  |  |  |  |  |  |  |  |  | 5,286 | 3,647 | $ 1,846
Total assets |  | $ 52,083 |  |  |  | $ 47,025 |  |  |  | $ 52,083 | $ 47,025 |
[1] | Total assets at December 31, 2018 and December 31, 2017 include the following assets of variable interest entity’s (“VIE’s”) that can only be used to settle the liabilities of the VIE’s: Cash, $656 and $130; Restricted Cash $70,261 and $40,272, Equipment, $1,032,599 and $657,333; and Other, $1,075 and $20,090 respectively.

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